--- a/mercurial/util.py	Wed Jun 03 14:22:21 2015 -0700
+++ b/mercurial/util.py	Wed May 20 18:00:05 2015 -0500
@@ -54,6 +54,7 @@
 oslink = platform.oslink
 parsepatchoutput = platform.parsepatchoutput
 pconvert = platform.pconvert
+poll = platform.poll
 popen = platform.popen
 posixfile = platform.posixfile
 quotecommand = platform.quotecommand